scholarly journals COMPLEX MODIFICATION OF GRAY CAST IRON

2017 ◽  
pp. 16-20
Author(s):  
O. S. Komarov ◽  
E. V. Rozenberg ◽  
K. E. Baranowski
Keyword(s):  
Cast Iron ◽  
Gray Cast Iron ◽  
Steel Plate ◽  
Machine Building ◽  
Gray Cast ◽  
High Quality ◽  
Iron Castings ◽  
Chill Zone ◽  
Surface Active

The influence of the complex modifier by chemical – active and surface-active additives of gray cast iron on the size of chill and on the width of molted iron zone was researched. The width of a chill zone and molted iron zones were measured at chank ends of various diameter cores. The cores were casted on a massive steel plate and also in standard chill tests. It was established that additional adding of surface-active bismuth in structure of various graphitizing modifiers promoted to reduce the width a chill zone and molted iron zones. It was established that the complex modifiers consisting of chemical – active and surfaceactive components are effective in fight with chill in cast iron castings and can be recommended for application in foundry shops of the entities of a machine-building profile for production of high-quality castings. 

Production of High-Quality Castings from Gray Iron by Differentiated Cooling in Iron Mould

2019 ◽  
Vol 973 ◽  
pp. 15-20 ◽  
Author(s):  
Natalia I. Gabelchenko ◽  
Artem A. Belov ◽  
Oksana N. Meshcheryakova
Keyword(s):  
Tensile Strength ◽  
Cast Iron ◽  
Cooling Rate ◽  
Gray Cast Iron ◽  
Gray Iron ◽  
Gray Cast ◽  
High Quality ◽  
Iron Castings

The paper considers the possibility of improving the quality of gray cast iron castings by controlling the cooling rate of castings in a mold. It is shown that the use of differentiated cooling can increase tensile strength of cast iron by 12-16%

Effect of Ar Purification on Microstructure and Properties of High Strength Gray Cast Iron

2011 ◽  
Vol 266 ◽  
pp. 241-245
Author(s):  
Juan Yang ◽  
Sheng Xin Liu ◽  
Qi Fei Hou ◽  
Hua Wei Sun ◽  
Yu Fu Sun ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Cast Iron ◽  
Optical Microscopy ◽  
Gray Cast Iron ◽  
High Strength ◽  
Gray Cast ◽  
Metallographic Examination ◽  
Iron Castings ◽  
Graphite Morphology ◽  
Quality Indexes

The effects of Ar purification on the impurity characteristic, graphite morphology and quality indexes of high strength gray cast iron were investigated by microstructures analysis and mechanical properties examination. The results show that there are a large amount of particles and floccule impurities in the specimens without Ar purification. The granular impurities usually have been incorrectly considered as “C-type” graphite observed by optical microscopy in the metallographic examination in the practical production of small and medium high strength gray cast iron castings. The amount of impurities is greatly decreased and the quality indexes of high strength gray cast iron with Ar purification are markedly improved.

Application of the Hydraulic Diameter of Interdendritic Space for Calculating the Ultimate Tensile Strength of Gray Cast Iron

2021 ◽  
Vol 410 ◽  
pp. 74-79
Author(s):  
Aleksandr A. Baron ◽  
Lyubov' V. Palatkina ◽  
Stanislav V. Palatkin
Keyword(s):  
Tensile Strength ◽  
Cast Iron ◽  
Comparative Analysis ◽  
Ultimate Tensile Strength ◽  
Gray Cast Iron ◽  
Volume Fraction ◽  
Hydraulic Diameter ◽  
Gray Cast ◽  
Iron Castings ◽  
Interdendritic Space

A comparative analysis of methods for estimating the gray cast iron ultimate tensile strength σu by the hydraulic diameter of interdendritic space DHydIP and the volume fraction of primary austenite dendrites fdc is performed. Almost the same accuracy of cast iron castings σu estimation according to both these parameters DHydIP and fdc of the primary microstructure is shown.

Dynamic measurements of the load on gray cast iron castings and contraction of castings during cooling in furan sand molds

2016 ◽  
Vol 237 ◽  
pp. 48-54 ◽  
Author(s):  
Naoya Marumoto ◽  
Haruki Kashimura ◽  
Kazuki Yoshida ◽  
Tsuneo Toyoda ◽  
Toshimitsu Okane ◽  
...  
Keyword(s):  
Cast Iron ◽  
Gray Cast Iron ◽  
Gray Cast ◽  
Dynamic Measurements ◽  
Iron Castings

Wear of nitride ceramic inserts in machining gray cast iron castings

2013 ◽  
Vol 33 (6) ◽  
pp. 343-347 ◽  
Author(s):  
V. V. Kuzin ◽  
S. N. Grigor’ev ◽  
S. Yu. Fedorov
Keyword(s):  
Cast Iron ◽  
Gray Cast Iron ◽  
Gray Cast ◽  
Iron Castings

The Formation Mechanism of Sweat Phosphide in a New Form and Comparison with Expansion Scab in the Gray Cast Iron Castings

2016 ◽  
Vol 11 (2) ◽  
pp. 347-355
Author(s):  
Amir Mohammad Sedigh Noohi ◽  
Naser Hamidnezhad ◽  
Azim Safikhani ◽  
Mohammad Reza Ghorbani Nia ◽  
Alireza Modaresi
Keyword(s):  
Cast Iron ◽  
Formation Mechanism ◽  
Gray Cast Iron ◽  
Gray Cast ◽  
Iron Castings ◽  
New Form

New Method for the Development of Porous Gray Cast Iron Castings

2009 ◽  
Vol 3 (2) ◽  
pp. 43-53
Author(s):  
A. K. S. Dawood ◽  
S. S. M. Nazirudeen
Keyword(s):  
Cast Iron ◽  
Gray Cast Iron ◽  
New Method ◽  
Gray Cast ◽  
Iron Castings

scholarly journals ASSESSMENT OF RANGES OF POSSIBLE CHANGE OF TEMPORARY RESISTANCE OF CAST IRON WITH LAMELLAR AND FLAKED GRAPHITE ON THEIR HARDNESS

2017 ◽  
pp. 40-45
Author(s):  
S. G. Sandomirskii
Keyword(s):  
Cast Iron ◽  
Gray Cast Iron ◽  
Analytical Description ◽  
Gray Cast ◽  
Test Pieces ◽  
Iron Castings ◽  
Check Test ◽  
Temporary Resistance ◽  
Graphite Inclusions

The analysis of ranges of possible change of temporary resistance of sB of castings from ductile and gray cast iron is carried out. The analytical description of ranges of change of sВ depending on casting BH hardness is developed. It is shown that the range of change of sВ of pig-iron castings, wider in comparison with steel, with the measured hardness of BH is caused variations of forms and the amount of graphite inclusions at the considered classes of cast iron and influence of thickness of a wall of casting from gray cast iron on dependence of sВ (HB). The result is intended for determination of the guaranteed casting size sВ without her destruction, when there is no information on sВ of check test pieces.

Teknologi Inokulasi Besi Cor Kelabu FC-250 Untuk Mencegah Pengerasan Pada Dove Tale Produk Ragum Tipe 125

2019 ◽  
Vol 16 (2) ◽  
Author(s):  
Amin Suhadi ◽  
Seodihono
Keyword(s):  
Mechanical Properties ◽  
Cast Iron ◽  
Treatment Process ◽  
Gray Cast Iron ◽  
Spare Parts ◽  
Gray Cast ◽  
Micro Structure ◽  
Control Factors ◽  
Seed Inoculation ◽  
Casting Industry

Production technology of metal casting industry in Indonesia needs to be improved, especially in the manufacturing of spare parts and box engine made of gray cast iron which has various wall thick such as dove tale construction. Microstructure of gray cast iron is influenced by cooling rate during casting, chemical composition and melting treatment process (inoculation). The part which has the thinnest thickness has the fastest cooling therefore, the grain boundary is smaller compared to other section. As a result this part has highest hardness and difficult to be machined. This research is conducted to solve this problem by modifying melting and solidification treatment process. The research starting from micro structure analysis, composition and mechanical properties tests on the product, and then conducting modification treatment through Taguchi method approach. Experimental results obtained show that the best level settings to control factors which affect to the uniformity of the microstructure and mechanical properties in gray cast iron is the addition of seed inoculation super ® 75, as much as 0.25% with the method of inoculation material entering into the Transfer Ladle.Teknologi produksi pada industri pengecoran di Indonesia masih membutuhkan perbaikan terutama dalam pembuatan komponen mesin perkakas dan peralatan pabrik yang terbuat dari besi tuang kelabu yang mempunyai variasi ketebalan yang besar seperti konstruksi ekor burung (dove tale). Pada pengecoran, struktur mikro dari besi tuang kelabu sangat dipengaruhi oleh kecepatan pendinginan, komposisi kimia dan proses perlakuan pada logam cair (inokulasi). Bagian yang mempunyai ukuran paling tipis mempunyai kecepatan pendinigan paling tinggi karena itu ukuran butirnya jauh lebih kecil dari bagian lain, akibatnya bagian ini mempunyai kekerasan lebih tinggi dan sulit dilakukan pengerjaan mesin. Penelitian ini bertujuan untuk memperbaiki hal ini yang terjadi pada dove taledengan cara memodifikasi proses perlakuan pada cairan besi dan proses pendinginan. Penelitian dimulai dari analisa struktur mikro, pengujian komposisi kimia, pengujian sifat mekanis pada produk kemudian dilakukan modifikasi menggunakan pendekatan metode statistik Taguchi. Hasil penelitian menunjukkan bahwa pengaturan terbaik yang dapat diperoleh untuk mendapatkan keseragaman struktur mikro dan sifat mekanis pada pengecoran besi tuang kelabu adalah penambahan seed inoculation super ® 75, sebesar 0.25% dengan metode pemasukan inokulasi kedalam Ladle pengangkut logam cair.Keywords: carbon, micro structure, hardness, inoculation

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